Cancel contract

In June Rewardsco phoned me and offer me a data contract the consultant promised me a 60gig anytime data bundle for R 199 My daughter and I asked the consultant about 5 times are you sure its anytime data as I was not interested in night time data. he assured me that it was anytime data and not night data. Ok then I received the simcard a few days later after the first month I received only 20 gig day data and 40 gigs night data. I refused to pay the the R199 as this is not what they promised me. I phoned MTN and Rewardsco about the issue. Rewardsco listen to the recording from the day the consultant spoke to me and they admit it was their fault. After months and Months of fighting and begging them to cancel the contract after it was their fault they said the contract will be canceled but because it is months later MTN still invoice me every month for the contract. Rewardsco promised me the 4th of December that they will pay all the money from the contract and I must pay MTN and then MTN will cancel the contract after sending my bankstatement to them I have not received any money yet. I phoned Rewardsco again the 10 December to ask what is going on and now they cut the line everytime they hear it is me. I just want the charges credit off my account and the contract to be canceled.